public class Demo4 {
public static void main(String[] args) {
    Runnable runnable = new Runnable(){
        @Override
        public void run() {
           
            while(true){ System.out.println("hello thread");
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    };
    Thread t = new Thread(runnable);
    t.start();
    while(true){
        System.out.println("hello main");
        try {
            
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
}
